Realism For Dummies

I really hate it (well maybe not hate it but feel a little shaken) when you're listening to music with your headphones on and suddenly you hear someone knocking on your wall, like the music is turned up too loud ..... then you suddenly realize that knocking was part of the recorded sounds. I guess that should be taken as a compliment to your headphones and the albums recording engineers. But your heart does skip a beat or two when it occurs. A minor fright of sorts!!